Means for protecting blast-furnace hearths.



No. 787,282. PATENTED APR. l1, 1905. G. E. DINKEY & H. A. BRASSBRT. MEANS FOR PROTECTING BLAST PURNACE HEARTHS.

APPLICATION FILED 0OT.19, 1903.

2 SHEETS-SHEET 1A @Humm @A @En @E No. 787,282. PATENTED APR. ll, 1905.

C. E. DINKBY & H. A. BRASSERT.

MEANS POR PROTECTING BLAST FURNACB HEARTHS.

APPLICATION `FILED 001219. 1903.

2 SHEETS-SHEET 2.

S R O T N E V m WITNESSES Patented April 11, 1905.

@Flaca DINKEY ANI) HERMANN A. BRASSICR', OF NOl'll'l BRA l) DOCK, PENNSYLVAN lA.

MEANS FOR PROTECTING BLAST-FURNACE HEAFTHS.

SPECIFICATION forming' part of Letters Patent No. 787,282, dated Apri] 11, 1905.

Application iiletl October 19,1903. Serial No. 177,594.

fo ////Y //'//o/// 1'/ lit/ry coli/ecrit:

Be it known that we, Cuantas lil. DINknv and llrnxmxx lamssnl'z'l, of North braddock` Allegheny county, Pennsylvania, have invented anew and useful Means for Protect- 1 mg' Blast-l* urnace llearths, ot which the tollowing' is a full` clear, and exact description, reference being' had to the accompanying' drawings, forming' part of this specification, in which Figure l is a side elevation of a furnace provided with om' invention, the furnace-wall being partly in vertical section. Fig'. 2 is a horizontal section on the line ll ll of Fig'. l, and Fig'. i3 is a detail view of one of the buckstaves.

(reat trouble has been experienced heretofore ie the maintenance of the hearth-walls of iron blast-furnaces, and although many expedients have been ti'ied for preserving' the wall none of them has hitherto proved satisfactory. 'lhe common practice has been to incase the wall of the hearth ina water-cooled ljacket or to surround it with a jacket of steel over which a stream of water is maintained. The `g'reat heat of the furnace at its hearth and the wear to which it is subiected render these devices unsatisfactory, and notwithstanding' their use the furi'iace-wall rapidly g'rows thin and breaking' out of the molten iron frequently occurs.

(lur invention consists in the discovery that we can do away with the surrounding' jacket which has heretofore always been used for the hearth of a blast-furnace. below the cindernotch and use in this hearth portion which incloses the molten metal a system of separated cooling'- plates with exposed brickwork between them. \\'e are thus enabled to easily repair this hearth portion in case of a breakout, while the liability to break-outs isg'reatly lessened by our system.

ln our preferred form the hearth of the fin'- naee below the cinder-notch is preserved by placing' horizontal water-cooled plates in the masonry around the circumferenceof the` hearth below the level of the cinder-notch and banding' the hearth strongly with encircling' l bandsof metal and also, preferably, with vertical buckstaves set within the circumference of the bands, 'lhese bands and staves support the furnace-wall against pressure from within, and the water-cooled plates preserve it from corrosion su tticiently to maintain a substantial thickness of brickwork within the bands, so that by the coaetion of the bands and staves and platesl the fm'nace-wall is preserved with entire safety. lVe dispense entirely with the ljacket heretofore ei'nployed to incase, the hearth, so that access to the wall can always be had for the purpose of removing' or rew placing' the plates. The bands are made in removable sections, so that they may be replaced or repaired without dilliculty.

ln the drawings, i2 2 are the twyers.

I), is the cinder-notch, and it is the level to which the iron ordinarily rises within the hearth before it is tapped. \\"e employ below the level of the cinder-notch inserted in the masonry of the furnace series of l1orizontal water-cooled plates 5 6 T S, each exi tending' around the circumference of the fui'- l nace. ln the drawings we show one of the rows T on the level of the iron tapping-hole and one row S below this level. Further, lower rows of plates may be used, if desired. The ordinary water-cooled hearth-jacket is dispensed with, and we use bands t) 9, which encircle the furnace between the rows of plates and are preferably made in sections held together detachably at their ends b v lugs 10, slotted connecting-bars ll, and keys ll. lYithin these bands at the lower part of the hearth are vertical lmckstaves l2 l2, which are built in the furnace-walls at the outside and distribute thereto the retaining' pressure ofthe bands. These staves are provided with recesses 13, forming' seats for the bands, and they thus preserve the bands from vertical displacement.

lt will be noted that if molten iron collects i upon the inner end of the cooling-plate the plate may be pulled out by digging' around it through the masonry. This enables us to easily and quickly remove plates from the l hearth-wall.

the level of the einder-notch, and water-cooled plates arranged in series in said holes, the outer vertically-extending face of the masonry wall being exposed between the sides of the plates, separated horizontal retaining-bands between the rows, and buelstaves between the bands, said structure constituting the sole retaining means for the hearth-wall; substantially as described.

In testimony whereof we have hereunto set our hands.

GHAS. E. DINKEY. H. A. BRASSERT. Ti tnesses:

GEO. B. BLEMING, H. M. CoRwIN. 

